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Add a new compare_bytes intrinsic instead of calling memcmp directly

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This commit is contained in:
Scott McMurray 2023-08-02 12:45:52 -07:00
parent 85fbb57149
commit 502af03445
17 changed files with 267 additions and 22 deletions
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4
src/tools/miri/tests/fail/uninit_buffer.stderr
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@ -1,8 +1,8 @@
error: Undefined Behavior: reading memory at ALLOC[0x0..0x10], but memory is uninitialized at [0x4..0x10], and this operation requires initialized memory
--> RUSTLIB/core/src/slice/cmp.rs:LL:CC
|
LL | let mut order = unsafe { memcmp(left.as_ptr(), right.as_ptr(), len) as isize };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ reading memory at ALLOC[0x0..0x10], but memory is uninitialized at [0x4..0x10], and this operation requires initialized memory
LL | let mut order = unsafe { compare_bytes(left.as_ptr(), right.as_ptr(), len) as isize };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ reading memory at ALLOC[0x0..0x10], but memory is uninitialized at [0x4..0x10], and this operation requires initialized memory
|
= help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
= help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information

4
src/tools/miri/tests/fail/uninit_buffer_with_provenance.stderr
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@ -1,8 +1,8 @@
error: Undefined Behavior: reading memory at ALLOC[0x0..0x8], but memory is uninitialized at [0x4..0x8], and this operation requires initialized memory
--> RUSTLIB/core/src/slice/cmp.rs:LL:CC
|
LL | let mut order = unsafe { memcmp(left.as_ptr(), right.as_ptr(), len) as isize };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ reading memory at ALLOC[0x0..0x8], but memory is uninitialized at [0x4..0x8], and this operation requires initialized memory
LL | let mut order = unsafe { compare_bytes(left.as_ptr(), right.as_ptr(), len) as isize };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ reading memory at ALLOC[0x0..0x8], but memory is uninitialized at [0x4..0x8], and this operation requires initialized memory
|
= help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
= help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information